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CSH Gels: Interpretation of 29Si MASNMR Spectra

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The detection of bridging tetrahedra, or Q2(L), in the silica chains constituting CSH gels is controversial. While some authors maintain that 29Si MASNMR can be used to distinguish between Q1 and Q2 units but not between the silicon environments associated with Q2 (intermediate position) and Q2(L) (intermediate and bridging position) units, others claim the contrary. The present article addresses this issue with a report on 29Si MASNMR studies of a number of calcium silicate hydrate gels. The findings showed that nuclear magnetic resonance can differentiate between Q2 and Q2(L) units in highly polymerized CSH gels with mean chain lengths (MCL) of over 12 and Ca/Si ratios of <1. At higher Ca/Si ratios, however, the MCL declined, with the concomitant rise in Q1 units. Under these conditions, in which it was practically impossible to distinguish between Q2 and Q2(L), the presence of a single signal for all Q2 units was assumed.
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Document Type: Research Article

Publication date: April 1, 2012

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